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/*
* Copyright (C) 2020 Graylog, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* .
*/
package org.graylog2.contentpacks;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import com.google.common.graph.ElementOrder;
import com.google.common.graph.Graph;
import com.google.common.graph.GraphBuilder;
import com.google.common.graph.ImmutableGraph;
import com.google.common.graph.MutableGraph;
import com.google.common.graph.Traverser;
import org.graylog2.contentpacks.constraints.ConstraintChecker;
import org.graylog2.contentpacks.exceptions.ContentPackException;
import org.graylog2.contentpacks.exceptions.EmptyDefaultValueException;
import org.graylog2.contentpacks.exceptions.FailedConstraintsException;
import org.graylog2.contentpacks.exceptions.InvalidParameterTypeException;
import org.graylog2.contentpacks.exceptions.InvalidParametersException;
import org.graylog2.contentpacks.exceptions.MissingParametersException;
import org.graylog2.contentpacks.exceptions.UnexpectedEntitiesException;
import org.graylog2.contentpacks.facades.EntityFacade;
import org.graylog2.contentpacks.facades.UnsupportedEntityFacade;
import org.graylog2.contentpacks.model.ContentPack;
import org.graylog2.contentpacks.model.ContentPackInstallation;
import org.graylog2.contentpacks.model.ContentPackUninstallDetails;
import org.graylog2.contentpacks.model.ContentPackUninstallation;
import org.graylog2.contentpacks.model.ContentPackV1;
import org.graylog2.contentpacks.model.LegacyContentPack;
import org.graylog2.contentpacks.model.ModelId;
import org.graylog2.contentpacks.model.ModelType;
import org.graylog2.contentpacks.model.constraints.Constraint;
import org.graylog2.contentpacks.model.constraints.ConstraintCheckResult;
import org.graylog2.contentpacks.model.entities.Entity;
import org.graylog2.contentpacks.model.entities.EntityDescriptor;
import org.graylog2.contentpacks.model.entities.EntityExcerpt;
import org.graylog2.contentpacks.model.entities.EntityV1;
import org.graylog2.contentpacks.model.entities.NativeEntity;
import org.graylog2.contentpacks.model.entities.NativeEntityDescriptor;
import org.graylog2.contentpacks.model.entities.references.ValueReference;
import org.graylog2.contentpacks.model.entities.references.ValueType;
import org.graylog2.contentpacks.model.parameters.Parameter;
import org.graylog2.utilities.Graphs;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.time.Instant;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
@Singleton
public class ContentPackService {
private static final Logger LOG = LoggerFactory.getLogger(ContentPackService.class);
private final ContentPackInstallationPersistenceService contentPackInstallationPersistenceService;
private final Set constraintCheckers;
private final Map> entityFacades;
@Inject
public ContentPackService(ContentPackInstallationPersistenceService contentPackInstallationPersistenceService,
Set constraintCheckers,
Map> entityFacades) {
this.contentPackInstallationPersistenceService = contentPackInstallationPersistenceService;
this.constraintCheckers = constraintCheckers;
this.entityFacades = entityFacades;
}
public ContentPackInstallation installContentPack(ContentPack contentPack,
Map parameters,
String comment,
String user) {
if (contentPack instanceof ContentPackV1) {
return installContentPack((ContentPackV1) contentPack, parameters, comment, user);
} else {
throw new IllegalArgumentException("Unsupported content pack version: " + contentPack.version());
}
}
private ContentPackInstallation installContentPack(ContentPackV1 contentPack,
Map parameters,
String comment,
String user) {
ensureConstraints(contentPack.constraints());
final Entity rootEntity = EntityV1.createRoot(contentPack);
final ImmutableMap validatedParameters = validateParameters(parameters, contentPack.parameters());
final ImmutableGraph dependencyGraph = buildEntityGraph(rootEntity, contentPack.entities(), validatedParameters);
final Traverser entityTraverser = Traverser.forGraph(dependencyGraph);
final Iterable entitiesInOrder = entityTraverser.depthFirstPostOrder(rootEntity);
// Insertion order is important for created entities so we can roll back in order!
final Map createdEntities = new LinkedHashMap<>();
final Map allEntities = new HashMap<>();
final ImmutableSet.Builder allEntityDescriptors = ImmutableSet.builder();
try {
for (Entity entity : entitiesInOrder) {
if (entity.equals(rootEntity)) {
continue;
}
final EntityDescriptor entityDescriptor = entity.toEntityDescriptor();
final EntityFacade facade = entityFacades.getOrDefault(entity.type(), UnsupportedEntityFacade.INSTANCE);
@SuppressWarnings({"rawtypes", "unchecked"}) final Optional existingEntity = facade.findExisting(entity, parameters);
if (existingEntity.isPresent()) {
LOG.trace("Found existing entity for {}", entityDescriptor);
final NativeEntity nativeEntity = existingEntity.get();
final NativeEntityDescriptor nativeEntityDescriptor = nativeEntity.descriptor();
/* Found entity on the system or we found a other installation which stated that */
if (contentPackInstallationPersistenceService.countInstallationOfEntityById(nativeEntityDescriptor.id()) <= 0 ||
contentPackInstallationPersistenceService.countInstallationOfEntityByIdAndFoundOnSystem(nativeEntityDescriptor.id()) > 0) {
final NativeEntityDescriptor serverDescriptor = nativeEntityDescriptor.toBuilder()
.foundOnSystem(true)
.build();
allEntityDescriptors.add(serverDescriptor);
} else {
allEntityDescriptors.add(nativeEntity.descriptor());
}
allEntities.put(entityDescriptor, nativeEntity.entity());
} else {
LOG.trace("Creating new entity for {}", entityDescriptor);
final NativeEntity createdEntity = facade.createNativeEntity(entity, validatedParameters, allEntities, user);
allEntityDescriptors.add(createdEntity.descriptor());
createdEntities.put(entityDescriptor, createdEntity.entity());
allEntities.put(entityDescriptor, createdEntity.entity());
}
}
} catch (Exception e) {
rollback(createdEntities);
throw new ContentPackException("Failed to install content pack <" + contentPack.id() + "/" + contentPack.revision() + ">", e);
}
final ContentPackInstallation installation = ContentPackInstallation.builder()
.contentPackId(contentPack.id())
.contentPackRevision(contentPack.revision())
.parameters(validatedParameters)
.comment(comment)
// TODO: Store complete entity instead of only the descriptor?
.entities(allEntityDescriptors.build())
.createdAt(Instant.now())
.createdBy(user)
.build();
return contentPackInstallationPersistenceService.insert(installation);
}
@SuppressWarnings("unchecked")
private void rollback(Map entities) {
final ImmutableList> entries = ImmutableList.copyOf(entities.entrySet());
for (Map.Entry entry : entries.reverse()) {
final EntityDescriptor entityDescriptor = entry.getKey();
final Object entity = entry.getValue();
final EntityFacade facade = entityFacades.getOrDefault(entityDescriptor.type(), UnsupportedEntityFacade.INSTANCE);
LOG.debug("Removing entity {}", entityDescriptor);
facade.delete(entity);
}
}
public ContentPackUninstallDetails getUninstallDetails(ContentPack contentPack, ContentPackInstallation installation) {
if (contentPack instanceof ContentPackV1) {
return getUninstallDetails((ContentPackV1) contentPack, installation);
} else {
throw new IllegalArgumentException("Unsupported content pack version: " + contentPack.version());
}
}
private ContentPackUninstallDetails getUninstallDetails(ContentPackV1 contentPack, ContentPackInstallation installation) {
final Entity rootEntity = EntityV1.createRoot(contentPack);
final ImmutableMap parameters = installation.parameters();
final ImmutableGraph dependencyGraph = buildEntityGraph(rootEntity, contentPack.entities(), parameters);
final Traverser entityTraverser = Traverser.forGraph(dependencyGraph);
final Iterable entitiesInOrder = entityTraverser.breadthFirst(rootEntity);
final Set nativeEntityDescriptors = new HashSet<>();
entitiesInOrder.forEach((entity -> {
if (entity.equals(rootEntity)) {
return;
}
final Optional nativeEntityDescriptorOptional = installation.entities().stream()
.filter(descriptor -> entity.id().equals(descriptor.contentPackEntityId()))
.findFirst();
if (nativeEntityDescriptorOptional.isPresent()) {
NativeEntityDescriptor nativeEntityDescriptor = nativeEntityDescriptorOptional.get();
if (contentPackInstallationPersistenceService
.countInstallationOfEntityById(nativeEntityDescriptor.id()) <= 1) {
nativeEntityDescriptors.add(nativeEntityDescriptor);
}
}
}));
return ContentPackUninstallDetails.create(nativeEntityDescriptors);
}
public ContentPackUninstallation uninstallContentPack(ContentPack contentPack, ContentPackInstallation installation) {
/*
* - Show entities marked for removal and ask user for confirmation
* - Resolve dependency order of the previously created entities
* - Stop/pause entities in reverse order
* - In case of error: Ignore, log error message (or create system notification), and continue
* - Remove entities in reverse order
* - In case of error: Ignore, log error message (or create system notification), and continue
* - Remove content pack snapshot
*/
if (contentPack instanceof ContentPackV1) {
return uninstallContentPack(installation, (ContentPackV1) contentPack);
} else {
throw new IllegalArgumentException("Unsupported content pack version: " + contentPack.version());
}
}
private ContentPackUninstallation uninstallContentPack(ContentPackInstallation installation, ContentPackV1 contentPack) {
final Entity rootEntity = EntityV1.createRoot(contentPack);
final ImmutableMap parameters = installation.parameters();
final ImmutableGraph dependencyGraph = buildEntityGraph(rootEntity, contentPack.entities(), parameters);
final Traverser entityTraverser = Traverser.forGraph(dependencyGraph);
final Iterable entitiesInOrder = entityTraverser.breadthFirst(rootEntity);
final Set removedEntities = new HashSet<>();
final Set failedEntities = new HashSet<>();
final Set skippedEntities = new HashSet<>();
try {
for (Entity entity : entitiesInOrder) {
if (entity.equals(rootEntity)) {
continue;
}
final Optional nativeEntityDescriptorOptional = installation.entities().stream()
.filter(descriptor -> entity.id().equals(descriptor.contentPackEntityId()))
.findFirst();
final EntityFacade facade = entityFacades.getOrDefault(entity.type(), UnsupportedEntityFacade.INSTANCE);
if (nativeEntityDescriptorOptional.isPresent()) {
final NativeEntityDescriptor nativeEntityDescriptor = nativeEntityDescriptorOptional.get();
final Optional nativeEntityOptional = facade.loadNativeEntity(nativeEntityDescriptor);
final ModelId entityId = nativeEntityDescriptor.id();
final long installCount = contentPackInstallationPersistenceService
.countInstallationOfEntityById(entityId);
final long systemFoundCount = contentPackInstallationPersistenceService.
countInstallationOfEntityByIdAndFoundOnSystem(entityId);
if (installCount > 1 || (installCount == 1 && systemFoundCount >= 1)) {
skippedEntities.add(nativeEntityDescriptor);
LOG.debug("Did not remove entity since other content pack installations still use them: {}",
nativeEntityDescriptor);
} else if (nativeEntityOptional.isPresent()) {
final Object nativeEntity = nativeEntityOptional.get();
LOG.trace("Removing existing native entity for {} ({})", nativeEntityDescriptor);
try {
// The EntityFacade#delete() method expects the actual entity object
//noinspection unchecked
facade.delete(((NativeEntity) nativeEntity).entity());
removedEntities.add(nativeEntityDescriptor);
} catch (Exception e) {
LOG.warn("Couldn't remove native entity {}", nativeEntity);
failedEntities.add(nativeEntityDescriptor);
}
} else {
LOG.trace("Couldn't find existing native entity for {} ({})", nativeEntityDescriptor);
}
}
}
} catch (Exception e) {
throw new ContentPackException("Failed to remove content pack <" + contentPack.id() + "/" + contentPack.revision() + ">", e);
}
final int deletedInstallations = contentPackInstallationPersistenceService.deleteById(installation.id());
LOG.debug("Deleted {} installation(s) of content pack {}", deletedInstallations, contentPack.id());
return ContentPackUninstallation.builder()
.entities(ImmutableSet.copyOf(removedEntities))
.skippedEntities(ImmutableSet.copyOf(skippedEntities))
.failedEntities(ImmutableSet.copyOf(failedEntities))
.build();
}
public Set listAllEntityExcerpts() {
final ImmutableSet.Builder entityIndexBuilder = ImmutableSet.builder();
entityFacades.values().forEach(facade -> entityIndexBuilder.addAll(facade.listEntityExcerpts()));
return entityIndexBuilder.build();
}
public Set resolveEntities(Collection unresolvedEntities) {
final MutableGraph dependencyGraph = GraphBuilder.directed()
.allowsSelfLoops(false)
.nodeOrder(ElementOrder.insertion())
.build();
unresolvedEntities.forEach(dependencyGraph::addNode);
final HashSet resolvedEntities = new HashSet<>();
final MutableGraph finalDependencyGraph = resolveDependencyGraph(dependencyGraph, resolvedEntities);
LOG.debug("Final dependency graph: {}", finalDependencyGraph);
return finalDependencyGraph.nodes();
}
private MutableGraph resolveDependencyGraph(Graph dependencyGraph, Set resolvedEntities) {
final MutableGraph mutableGraph = GraphBuilder.from(dependencyGraph).build();
Graphs.merge(mutableGraph, dependencyGraph);
for (EntityDescriptor entityDescriptor : dependencyGraph.nodes()) {
LOG.debug("Resolving entity {}", entityDescriptor);
if (resolvedEntities.contains(entityDescriptor)) {
LOG.debug("Entity {} already resolved, skipping.", entityDescriptor);
continue;
}
final EntityFacade facade = entityFacades.getOrDefault(entityDescriptor.type(), UnsupportedEntityFacade.INSTANCE);
final Graph graph = facade.resolveNativeEntity(entityDescriptor);
LOG.trace("Dependencies of entity {}: {}", entityDescriptor, graph);
Graphs.merge(mutableGraph, graph);
LOG.trace("New dependency graph: {}", mutableGraph);
resolvedEntities.add(entityDescriptor);
final Graph result = resolveDependencyGraph(mutableGraph, resolvedEntities);
Graphs.merge(mutableGraph, result);
}
return mutableGraph;
}
public ImmutableSet collectEntities(Collection resolvedEntities) {
// It's important to only compute the EntityDescriptor IDs once per #collectEntities call! Otherwise we
// will get broken references between the entities.
final EntityDescriptorIds entityDescriptorIds = EntityDescriptorIds.of(resolvedEntities);
final ImmutableSet.Builder entities = ImmutableSet.builder();
for (EntityDescriptor entityDescriptor : resolvedEntities) {
if (EntityDescriptorIds.isSystemStreamDescriptor(entityDescriptor)) {
continue;
}
final EntityFacade facade = entityFacades.getOrDefault(entityDescriptor.type(), UnsupportedEntityFacade.INSTANCE);
facade.exportEntity(entityDescriptor, entityDescriptorIds).ifPresent(entities::add);
}
return entities.build();
}
private ImmutableGraph buildEntityGraph(Entity rootEntity,
Set entities,
Map parameters) {
final Map entityDescriptorMap = entities.stream()
.collect(Collectors.toMap(Entity::toEntityDescriptor, Function.identity()));
final MutableGraph dependencyGraph = GraphBuilder.directed()
.allowsSelfLoops(false)
.expectedNodeCount(entities.size())
.build();
for (Map.Entry entry : entityDescriptorMap.entrySet()) {
final EntityDescriptor entityDescriptor = entry.getKey();
final Entity entity = entry.getValue();
final EntityFacade facade = entityFacades.getOrDefault(entity.type(), UnsupportedEntityFacade.INSTANCE);
final Graph entityGraph = facade.resolveForInstallation(entity, parameters, entityDescriptorMap);
LOG.trace("Dependencies of entity {}: {}", entityDescriptor, entityGraph);
dependencyGraph.putEdge(rootEntity, entity);
Graphs.merge(dependencyGraph, entityGraph);
LOG.trace("New dependency graph: {}", dependencyGraph);
}
final Set unexpectedEntities = dependencyGraph.nodes().stream()
.filter(entity -> !rootEntity.equals(entity))
.filter(entity -> !entities.contains(entity))
.collect(Collectors.toSet());
if (!unexpectedEntities.isEmpty()) {
throw new UnexpectedEntitiesException(unexpectedEntities);
}
return ImmutableGraph.copyOf(dependencyGraph);
}
private void ensureConstraints(Set requiredConstraints) {
final Set fulfilledConstraints = new HashSet<>();
for (ConstraintChecker constraintChecker : constraintCheckers) {
fulfilledConstraints.addAll(constraintChecker.ensureConstraints(requiredConstraints));
}
if (!fulfilledConstraints.equals(requiredConstraints)) {
final Set failedConstraints = Sets.difference(requiredConstraints, fulfilledConstraints);
throw new FailedConstraintsException(failedConstraints);
}
}
public Set checkConstraints(ContentPack contentPack) {
if (contentPack instanceof ContentPackV1) {
return checkConstraintsV1((ContentPackV1) contentPack);
} else if (contentPack instanceof LegacyContentPack) {
return Collections.emptySet();
} else {
throw new IllegalArgumentException("Unsupported content pack version: " + contentPack.version());
}
}
private Set checkConstraintsV1(ContentPackV1 contentPackV1) {
Set requiredConstraints = contentPackV1.constraints();
final Set fulfilledConstraints = new HashSet<>();
for (ConstraintChecker constraintChecker : constraintCheckers) {
fulfilledConstraints.addAll(constraintChecker.checkConstraints(requiredConstraints));
}
return fulfilledConstraints;
}
private ImmutableMap validateParameters(Map parameters,
Set contentPackParameters) {
final Set contentPackParameterNames = contentPackParameters.stream()
.map(Parameter::name)
.collect(Collectors.toSet());
checkUnknownParameters(parameters, contentPackParameterNames);
checkMissingParameters(parameters, contentPackParameterNames);
final Map contentPackParameterValueTypes = contentPackParameters.stream()
.collect(Collectors.toMap(Parameter::name, Parameter::valueType));
final Set invalidParameters = parameters.entrySet().stream()
.filter(entry -> entry.getValue().valueType() != contentPackParameterValueTypes.get(entry.getKey()))
.map(Map.Entry::getKey)
.collect(Collectors.toSet());
if (!invalidParameters.isEmpty()) {
throw new InvalidParametersException(invalidParameters);
}
final ImmutableMap.Builder validatedParameters = ImmutableMap.builder();
for (Parameter contentPackParameter : contentPackParameters) {
final String name = contentPackParameter.name();
final ValueReference providedParameter = parameters.get(name);
if (providedParameter == null) {
final Optional defaultValue = contentPackParameter.defaultValue();
final Object value = defaultValue.orElseThrow(() -> new EmptyDefaultValueException(name));
final ValueReference valueReference = ValueReference.builder()
.valueType(contentPackParameter.valueType())
.value(value)
.build();
validatedParameters.put(name, valueReference);
} else if (providedParameter.valueType() != contentPackParameter.valueType()) {
throw new InvalidParameterTypeException(contentPackParameter.valueType(), providedParameter.valueType());
} else {
validatedParameters.put(name, providedParameter);
}
}
return validatedParameters.build();
}
private void checkUnknownParameters(Map parameters, Set contentPackParameterNames) {
final Predicate containsContentPackParameter = contentPackParameterNames::contains;
final Set unknownParameters = parameters.keySet().stream()
.filter(containsContentPackParameter.negate())
.collect(Collectors.toSet());
if (!unknownParameters.isEmpty()) {
// Ignore unknown parameters for now
LOG.debug("Unknown parameters: {}", unknownParameters);
}
}
private void checkMissingParameters(Map parameters, Set contentPackParameterNames) {
final Predicate containsParameter = parameters::containsKey;
final Set missingParameters = contentPackParameterNames.stream()
.filter(containsParameter.negate())
.collect(Collectors.toSet());
if (!missingParameters.isEmpty()) {
throw new MissingParametersException(missingParameters);
}
}
}
